Re: [Elecraft] K3s noise figure spec

On 6/30/2020 4:31 PM, Dave Sublette wrote: Does anybody KNOW what the noise figure is for the 50MHz preamp on the K3s? It isn't listed in the specifications. I don't know, but I'm using an ARR GasFET preamp at the RXIN/OUT patch point, and the ARR 0.5 NF seems to be slightly better than the

Re: [Elecraft] K2 K2/100 post FD review

Watts is Volts X Amps. Fewer Volts means more Amps. More Amps means more work for power supply, leading to fewer Volts. Fewer Volts means ...( you get the picture). Sent from my iPhone ...nr4c. bill > On Jun 30, 2020, at 8:37 PM, Mike Kopacki wrote: > > I didn’t have ring connectors big

Re: [Elecraft] Voltage Drop

Truth be told, I don't think so. I use almost entirely low end consumer stuff, mostly because I blow up at least a meter a year two, when I put the 10A scale across a storage battery, The 750VDC scale across 2KV, or 400V to the low Ohms scale. When it's a free harbor Freight meter, I don't lose

Re: [Elecraft] Voltage Drop

You have trouble with Fluke DMM’s? Sent from my iPhone > On Jun 30, 2020, at 9:06 PM, Wilson Lamb wrote: > > Are we going to talk about RF getting into DMMs? > The DMMs I've used can't be used on tractors or under the hood of cars not > even on the battery, because of ignition noise. >

Re: [Elecraft] K3s noise figure spec

Dave, I don't know the NF, but my K3 with PR6 (which the K3s supposedly has internal) has a MDS of -145 dBm at 500-Hz bandwidth. That is fine for 50-MHz on eme (most demanding mode). I have a ARR P50VDG preamp at the base of my 6m-eme tower which provides 0.5 dBNF with 24 dB gain. I run

Re: [Elecraft] K2 K2/100 post FD review

Hi Mike, Your email states: " The P/S output is 13.6V." Did you measure 13.6 volts at the output of your power supply under load when your transmitter is outputting 100 watts? 73 Frank W3LPL - Original Message - From: "Mike Kopacki" To: donw...@embarqmail.com Cc:

Re: [Elecraft] K2 K2/100 post FD review

Mike, I would expect that 12.6 volts or greater on transmit would give you better power on the higher bands. You do have either a power supply problem or a Power supply to K2/100 cabling problem. Try the base K2 only tests that I posted about. 73, Don W3FPR On 6/30/2020 8:34 PM, Mike

[Elecraft] Voltage Drop

Are we going to talk about RF getting into DMMs? The DMMs I've used can't be used on tractors or under the hood of cars not even on the battery, because of ignition noise. There's a lot to be said for old school needle meters! WL __

Re: [Elecraft] Weird sounds coming from my K1...need a qualified exorcist

Your link resulted in a page not found. So I don't know what sound it made. It may be associated with the sidetone, but I am not certain. 73, Don W3FPR On 6/30/2020 8:36 PM, Stephen Roberts wrote: http://w1sfr.com/weird-k1-audio/ Here's what happened: I

Re: [Elecraft] K2 K2/100 post FD review

Mike, The K2 RF gain is higher on 80, 40, and 30 meters.  It takes a bit more drive and current on the higher bands. Have you verified the power output of the base K2 with the KPA100 removed?  That is an important parameter to investigate. After verifying that the base K2 is capable of

Re: [Elecraft] K2 K2/100 post FD review

Maybe because as the voltage drops below 12V the PA starts to be “less pure” on the higher bands and starts sending junk to the band pass filters. The BPF do their job and filter out the junk and what’s left in the passband to go to the wattmeter is less than rated. I’m sure Don could

Re: [Elecraft] K3s noise figure spec

Dave, I don't know the answer to your question, but if you use a preamp at the antenna, you will not need to use the preamp in the K3S. The preamp at the the antenna will set the noise figure for the system. The preamp at the K3S end of the feedline will have to consider the feedline loss.

[Elecraft] Weird sounds coming from my K1...need a qualified exorcist

http://w1sfr.com/weird-k1-audio/ Here's what happened: I turned on the radio to get on the air tonight. It made this sound when I turned it on and after it booted up the sound went away. I plugged in the cable to my paddle and it made the sound. It makes the

Re: [Elecraft] K2 K2/100 post FD review

I didn’t have ring connectors big enough but I did have spade connectors. I crimped and soldered them but there was no change in the voltage readings during receive and transmit. Is it possible that the power supply is failing? Why, if the voltage drops during transmit to 11.6V, does the

[Elecraft] K3s noise figure spec

Does anybody KNOW what the noise figure is for the 50MHz preamp on the K3s? It isn't listed in the specifications. I need to know in order to make system noise figure calculations. My feedline is going to be long (low loss, but long) and I'm trying to determine if I will need a preamp mounted

Re: [Elecraft] K2 K2/100 post FD review

Mike, The red and black assembly is an Anderson Power Pole connector - commonly called APP. For the small receive current drawn, the voltage drop in the wire and connectors should be close to zero, so the 0.2 volts is significant for #12 wire unless there is something not properly tightened

Re: [Elecraft] K2 K2/100 post FD review

__ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list:

Re: [Elecraft] K2 K2/100 post FD review

__ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list:

Re: [Elecraft] K2 K2/100 post FD review

Mike, You should have only 0.3 volts drop IN the K2 itself, so given your display of 13.1 volts on the K2, that says you have a substantial voltage drop in the power cable. Is it wired directly to the power supply?  Are all the connections tight?  Is the APP assembly at the K2 correct?  Look

Re: [Elecraft] K4 Books

I solved my issues with understanding Elecraft radios, I prefer all thee methods of learning to fully know the ins and outs. What assists me most after reading all pertinent parts to my use, is to search a downloaded PDF manual to find what I have forgotten and need to refresh my memory. To

Re: [Elecraft] K2 K2/100 post FD review

The connections may be tight, but how many are there? Are you running straight from the power supply to the radio without any intervening junction points, Rig Runners, etc.? Grant NQ5T > On Jun 30, 2020, at 5:32 PM, Mike Kopacki wrote: > > Don... > > The power supply is an MFJ 13.8V/25A

Re: [Elecraft] K2 K2/100 post FD review

Don... The power supply is an MFJ 13.8V/25A switching power supply. It measures 13.63V at the terminals. The K2 shows 13.1V in receive mode. During transmit on all bands, the K2 shows 11.3-11.9V, depending on the band. All the power connections appear to be tight. Thanks, Mike NJ2OM >

Re: [Elecraft] kx2 SSB always in TX

Mike, I am wondering if the shaft (sleeve) on the mic plug is just a bit too long - try backing the plug out a tiny bit at a time (thickness of heavy paper) to see if that takes care of it. That is all I can think of.  I suggest you contact supp...@elecraft.com for additional suggestions.

Re: [Elecraft] kx2 SSB always in TX

Hi No, nothing else plugged into the radio. As for a 2nd Mic, not at this time and I am not at home near my workbench which has lots of bits to try things. If I have time tonight, I will open up the Mic and do some more tracing. I think we have gone as far as we can go at this point given the

Re: [Elecraft] kx2 SSB always in TX

Mike, Solution unknown - either you have a bad mic plug on that MH3, or there is a problem with your KX2 mic jack. Do you know anyone else who has a KX2 or KX3 that could try your microphone? 73, Don W3FPR On 6/30/2020 3:02 PM, Michael Walker wrote: Ops, missed that.  I used shield ground,

Re: [Elecraft] kx2 SSB always in TX

What mic are you using? Is anything else plugged into the radio? Sent from my iPhone ...nr4c. bill > On Jun 30, 2020, at 1:03 PM, Michael Walker wrote: > > Hi All > > I have had a kx2 since they first came out and I have chased this problem > since day 1. But, since I never use it on

Re: [Elecraft] kx2 SSB always in TX

Ops, missed that. I used shield ground, not logic ground. However, when I tested Ring 1 to Ring 2, it is open and then shorts when you push the PTT button. This seems to be working as designed. I did confirm that mic is plugged in all the way and did a close visual look at it to make sure.

Re: [Elecraft] kx2 SSB always in TX

Mike, Did you read the continuity between the 1st and 2nd rings of the MH3 plug? The MH3 PTT connects those two rings (and not the shell). 73, Don W3FPR On 6/30/2020 1:27 PM, Michael Walker wrote: Thanks Don Plugging a Stereo  (3 conductor) does not cause the radio to go into TX with

Re: [Elecraft] kx2 SSB always in TX

Thanks Don Plugging a Stereo (3 conductor) does not cause the radio to go into TX with Menu:MIC BTN set to Ptt. Looking like a bad MH3. I did ohm out the MIC between ground and the PTT line and it did show open. I would be expecting a short. Mike va3mw On Tue, Jun 30, 2020 at 1:18 PM Don

Re: [Elecraft] kx2 SSB always in TX

Mike, Do you have a normal stereo plug available? - or a stereo audio cable with nothing on the far end? If so, plug that in and see if the same thing happens - make certain it is in all the way. If not, the MH3 has a problem. If it still goes into transmit, the KX2 has a problem. 73, Don

Re: [Elecraft] kx2 SSB always in TX

Update on this. If you are in the Menu, the XMIT does not work. If out of the Menu, it works as expected as does Vox. However, the External Mic problem still exists. I did Ohm out the MH3 PTT line and it isn't shorted at all, so the Mic is not the issue. Mike va3mw On Tue, Jun 30, 2020 at

[Elecraft] kx2 SSB always in TX

Hi All I have had a kx2 since they first came out and I have chased this problem since day 1. But, since I never use it on SSB, I have never worried about it. s/n 337 Everything I plug in the MH3 Mic, the radio goes into TX. I have the latest firmware on it. If Menu:MIC BTN is set to OFF, it

Re: [Elecraft] K3 at Field Day

I did, too. Love my K3! 1039 QSOs and all on CW. Letting my microphone get dusty... On Mon, Jun 29, 2020 at 8:02 PM Tom Doligalski via Elecraft < elecraft@mailman.qth.net> wrote: > I ran my K3 hard this year as 1D in Field Day. What a champ: never even > got warm! > > Maybe a K4 next year? > >

Re: [Elecraft] KX2 Drift During Field Day

Richard, Drift was seen on the KX2 digital display, and indicated by concomitant very mild audio distortion from being slightly off frequency. I am perfectly willing to accept that I may have just been getting a small bit of RFI, but was just curious if anyone else has seen this behavior before.

Re: [Elecraft] KX2 Drift During Field Day

Are you talking about the output frequency as measured on another device? Or the numeric readout on the radio's own display? I've seen shifts in some situations on 2m, which I think was RF getting into it. If you turn off Mic Up/Down button control maybe it will help there. I've had issues where